/ˈaɪdə/, /ˈaɪdɚ/
OriginFrom Icelandic æðar, genitive of æðr, probably reaching English via Swedish eider (now ejder), from a North Germanic root.
- Any of the species of Somateria spp. and Polysticta stelleri or of the seaduck subfamily Merginae, which line their nests with fine down (taken from their own bodies).
- A river in Germany, the boundary between Schleswig and Holstein.
Formseiders(plural)